Roof Warranty After Spray in Under Foam Attic Insulation

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Upgrading a home’s exterior, updating home appliances and energy efficacy are constantly on most homeowner’s minds.  Making a home more energy efficient and more comfortable at the same time just makes since. One way to accomplish this is better insulation. Spray foam attic insulation is becoming more and more popular for housing insulation. In this effort to upgrade the home are homeowners voiding their roofing warranty? The roof warranty after spray in under foam attic insulation is a very confusing question. 

Benefits and Downsides to Spray Foam Insulation

The (EPA) US Environmental Protection Agency has recognized spray foam insulation as a superior alternative to batt insulation of years past. Acting as both an air sealant and an insulator, spray in under foam insulation is estimated to reduce HVAC sizing by roughly 35% on average.


With two types of spray foam insulation available, open cell and closed cell each provides both parts of the building envelope. The air barrier and the insulation. With spray foam insulation being both the air barrier and insulation, the proper alignment of air barrier and insulation is guaranteed. 

The possible downside to spray foam insulation is one, spray foam installers miss many of the air leakage sites. Many inexperienced spray foam insulation installers do not understand the building envelope and either spray too much or too little foam. One last potential problem is spray foam can contract and pull away from the framing. Any of these issues will create a problem with your insulation and will not perform properly. 

Roof Warranty After Spray in Under Foam Attic Insulation: Do You Have Warranty?

Things to do before adding spray foam insulation to your attic. First call your local roofing contractor and find out what brand of shingle you have on your roof. If this roofing contractor did not install your roof he will need to know what shingle you have. Refer to your roof installation information. There are updated technical service bulletins from each manufacturer, a top roofing contractor should have these.


Owens Corning extends warranty up to 100 squares but only on residential roofs, not commercial. Atlas Roofing Company will void your warranty as soon as you spray the foam in your attic and close the ventilation system. CertainTeed Corporation makes a type of spray in under foam insulation so they give full warranty on their roofing shingles. GAF has a very confusing technical bulletin, in half of the wording they say spray in foam does not void their warranty and in the other half describe what happens to shingles without proper ventilation and explain they do not cover any damage to shingles from over-heating.


Before you get past checking on spray in under deck foam insulation hire an expert roofing contractor and first check and make sure you will not void your roofing shingle warranty. After you are sure your roofing warranty will remain intact hire an experienced spray in foam insulation company to make sure you get the proper building envelope coverage. 



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